In order to know how to replace a sash cord you need to understand the basics of a double hung window. A double hung window has two sashes one on top and one on bottom. A sash is the framework that holds the glass. The sashes slide up and down within a window frame. The side frames are the jambs. Heavy metal sash weights connect to sashes with a rope-and-pulley system hidden behind the jambs. The weights provide a counterbalance that makes the sash easy to open.
Stops or wood moldings attached to the jambs create grooves that a sash window uses to slide. In order to remove the frame you need to pry the parting stop and the inside stop from the jambs.
To begin this project, gather the materials and tools you will need to replace a broken sash cord. This includes new sash cord, a putty knife, a utility knife, finishing nails, a hammer, putty, paintbrushes and paint for possible touch-ups.
Remove the molding on both sides of the bottom sash. Place your putty knife near each nail that is holding the wood in place and gently pry them loose. Practice patience as the wood can split easily if you try to rush.
Once the moldings are off, pull the sash out. You can remove the broken sash cord from its keyed slot. There should be a panel which allows access to the sash weight, remove it. If no panel exists, you will need to remove the side window casing to access the weight.
Sometimes these panels have layers of paint on them, you will need to chip the paint away to locate the screws that are keeping the panel secure. Once the panel is out, cut off any remaining cord. Feed the new sash cord over the pulley and down into the cavity that holds the weight until you can see it in the access panel. The new cord should be tied to the weight with a strong knot but not too bulky as it can bind in the window frame. Put the weight back in the cavity and put a knot in the other end of the cord allowing the weight to hang three inches above the windowsill when the window is in a fully raised position.
Now you are ready to put the framework back into place. Use the finishing nails to secure the moldings. If there are any gaps, you can use the putty to fill them. If any paint chipped away during this process, repaint it. You are done with your project and should have a totally functioning window. As a do-it-yourself homeowner, you can master how to replace a sash cord in your double hung window with the right information.
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